JPS6323255A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To retrieve a recording position without feeding a magnetic tape unnaturally, by bringing the magnetic tape into contact with a fixed drum without winding it over a prescribed angle, at time of a fast feeding, or a rewinding operation. CONSTITUTION:At the time of the rewinding, or the fast feeding operation, movable tape guides 2b and 2c on a supply side are moved to intermediate stop positions, then being fixed, and movable tape guides 2b' and 2c' are moved to the stop positions, then being fixed, and also, a movable tape guide 7 is kept at the same position as at time of recording and reproduction. Keeping the above state, the magnetic tape 3 is fed from a supplying reel 18 side to a take up reel 19 side at the time of fast feeding, and it is fed in the reverse direction at high speed at the time of rewinding, however, since the magnetic tape 3 is brought into contact with full width erase head 5 stably in both cases, it is possible to satisfactorily detect a recording position identification signal recorded on the magnetic material plane of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape device, and more particularly to a magnetic tape device that uses a method of reading a signal (also called a cue signal) that identifies a recording position recorded on a magnetic tape to search for a recording position. It is related to.

Recent VTr? (Video tape recorder) devices, and magnetic tape devices have advanced high-density recording, making it possible to record and play over long periods of time, and one cassette tape can record up to 4
As it has become possible to record and play back 6 hours, the need to search for a specific recording position on a magnetic tape has increased. With conventional consumer magnetic tape devices, it is impossible to start a search from the middle of the tape supply reel disk, and signals identifying recording positions are recorded on multiple recording positions on a single cassette tape. This problem can be solved by using a method in which the problem is detected and then searched, but in conventional magnetic tape devices, such a method could not be adopted due to the structure of the tape transport device. . The tape running device of a VH3 type VTR device will be explained below as an example.

FIGS. 1 and 2 are system diagrams showing a parallel loading type tape running device which is widely used in conventional VH3 type VTR devices. Figure 1 shows the tape running path during recording and playback operations (loading state),
The figure shows rewind and fast forward operations (unloading state)
The tape running path is shown respectively, and in the figure! ! + is a rotating drum with two video heads (la) and (lb);
is fixed at exactly 180° with respect to the center of the rotating drum +1) and slightly protrudes from the periphery of the drum.

(2a), (2b), (2c) are loading tape guides on the supply side (supply side), (2a')
, (2b') and (2c') are loading tape guides on the take-up side (tick-up side) that work to stably load the magnetic tape (3) on the rotating drum (1). Guide (2b), (
2c) (2b').

(2c') can be moved between two types of stopping positions shown by dotted lines and solid lines, and by moving from the position shown by solid lines in Fig. 2 to the position shown by solid lines in Fig. 1, the second As shown in the figure, the magnetic tape (3) in the unloaded state is pulled out from the tape rack and mounted on the rotating drum (1).

(4a) is a guide roller on the supply side, and (4b) is a guide roller on the take-up side, which is an impedance roller for reducing small vibrations of the tape (3) and jitter.

+51 is a full-width erasing head, (61, +71 are tape guides, tape guide mark 7) can be moved between two types of stop positions shown by dotted lines and solid lines, and the position shown by solid lines in Figure 2 1 to the position shown by the solid line in FIG.
5). (8) is the tape tension regulator, (9) is the audio erasing head, aI]l is the audio signal and control signal head, and these heads (91, Ql are integrated to provide a contract accuracy. 1111 is the tape The guide, Q21, is a pinch roller, and the station α is a capstan. During recording and reproducing as shown in FIG. It is advanced in the direction of the arrow at a constant speed. Also, during rewinding and fast forwarding as shown in Fig. 2, the pinch roller side moves to a position away from the capstan 031 and stops. Cassette containing tape (3), C
IS+, αQ, and aη are tape guides provided inside the cassette α to smoothly supply or wind up the stored magnetic tape (3), αυ is the supply reel inside the cassette, and Q9) is the tape guide for cassette 0. The winding rule is within .9.

In the VTR device configured as described above, during recording and playback operations, the magnetic tape (3) is moved through the movable tape guide structure A,
(2b), (2c), (2b'), (2c
), f7) are supported as shown in Figure 1 to the video/de (la), (lb), full width erase head (5), audio erase head (9) and audio/signal, control signal head aml. each head performs its own operation. In addition, for rewinding and fast forwarding operations, the tape guides (2b), (2c) on the supply side, the tape guides (2b'), (2c') on the take-up side, and the tape guide (7) are stored in the cassette αa. As a result, the magnetic tape (3) is generally run at a speed 20 to 30 times faster in the unloaded state as shown in FIG. 2 than in the recording and reproducing modes.

In such conventional VTR devices, the method of searching for a specific recording position on the magnetic tape during rewinding or fast forwarding is to send a signal on the magnetic tape that identifies the recording position for two reasons that will be explained later. How to record
``1 pa death, -27, -5 245-:, l
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Or, since it was necessary to use a method of counting the number of revolutions of the take-up reel, it was not possible to start a search from the middle of the magnetic tape, and it was not possible to accurately detect multiple recording positions on a single magnetic tape. In other words, the VTR devices shown in Figures 1 and 2 have the disadvantage that it is impossible to change the tape running path in the loading state during recording and playback operations and in the unloading state during rewinding and fast-forwarding operations. Because of the large difference in magnetic tape, even if a recording position identification signal is recorded on the magnetic tape during recording and reproducing operations, it is difficult to rewind and detect it during fast forwarding operations. i.e. records,
During playback, the full-width erase head (5) and audio erase head (
9) Or, even if it is possible to record the identification signal by using either the audio signal or the control signal as the recording position identification signal head, it is possible to rewind this,
This is not possible because the traveling paths of the word tape that are detected by the same head during fast-forwarding are different. Therefore, in this case the second
A dedicated head for calling the recording position identification signal is required, which contacts the magnetic surface of the magnetic tape (3) within the tape running path in the unloading state shown in the figure. In order to provide this read-only head, it was possible to achieve the following conditions: it must not interfere with the movement of the magnetic tape (3) during tape loading, and it must be in stable contact with the magnetic tape (3) during unloading. However, even if it were realized, the device would be complicated and expensive, making it impractical.

In addition, in order to record and detect the recording position identification signal with the same head, when rewinding and fast forwarding in the loading state shown in Fig. 1, the currently used thickness 2
A thin tape (3) of 0 μm or less is attached to a rotating drum (1
), the magnetic tape (3) is moved at high speed while being wrapped at an angle of 180° or more, increasing the risk of damage to the tape and wear of the head.
This will result in a malfunction.

For the above-mentioned reasons, conventional VTR devices have to perform fast forwarding and rewinding operations in the unloading state, and count the number of revolutions of the supply reel α or take-up reel α to search for the recording position.

The present invention eliminates the above-mentioned drawbacks of conventional magnetic tape devices, and provides a method for recording a recording position on a magnetic tape and retrieving it using an identification signal, with a simple structure, and without forcing the tape to run unnecessarily, which could lead to malfunctions. The purpose of this invention is to obtain a magnetic tape device that can be implemented using Jffl. The invention will be explained below with reference to the drawings.

FIG. 3 is a system diagram showing the tape running path during rewinding and fast-forwarding operations according to an embodiment of the present invention. In the diagram, each part is the same as in FIGS. 1 and 2 and is given the same reference numeral. It is. What is different from the conventional model is the movable tape guide (2b).

(2c) has three stop positions, and the full-width erase head (5) also has the function of recording and reproducing a recording position identification signal. In such a device, first, during recording and reproduction, a movable tape guide (2b),
(2c) is the other movable tape guide (2b')
, (2c')+(71 and the position shown in FIG. 1 (referred to as the first position), and recording and reproduction are performed in the same tape running path as in the conventional device.At this time, the recording position identification signal is Recording is performed on the entire width of the magnetic tape by the full-width erase head (5).The period during which the recording position identification signal is applied to the full-width erase head (5) (generally several hundred meters)
sec") shall stop functioning as a full-width erasing head.Next, during rewinding and fast forwarding operations, the movable tape guides (2b) and (2c) on the supply side as shown in Figure 3.
is moved to an intermediate stop position (referred to as the second position) and fixed, and the movable tape guides (2b') and (2c'
) is fixed at the stop position shown by the solid line, and the movable tape guide (7) is kept at the same stop position as during recording and playback. In this situation, the magnetic tape (3)
is tape guide f61. +71, in contact with the tape tension regulator (8) and the full-width erase head (5), and slightly in contact with a portion of the rotating drum [11;
The travel path of the magnetic tape (3) is shown in FIG. Here, the magnetic tape (3) is in contact with the rotating drum (1), but since this contact angle is small, there is no mutual Pj rubbing contact, and even if the magnetic tape (3) runs at high speed, the magnetic The tape (3) will not cause wear and tear on the damaged joint. Generally, a cart-type VTR device has a structure in which a fixed drum (not shown in the figure) is provided below a rotating drum (1), and in this case, a magnetic tape (
3) makes slight contact with a part of the rotating drum and the slant groove of the stationary drum, but this actually causes the magnetic tape (
This is useful for reducing the vibration in the width direction (3), and has the advantage of stabilizing the contact between the head surface of the full-width erasing head (5) and the magnetic surface of the magnetic tape (3). In this state, during fast forwarding, the magnetic tape (3) runs at high speed from the coarse side of the supply reel to the take-up reel αω side, and during rewinding, the magnetic tape (3) runs at high speed in the opposite direction. (5), it is possible to sufficiently detect the recording position identification signal recorded on the magnetic tape surface. Incidentally, during this fast forwarding and rewinding, the pinch roller hit leaves the camping stand 01, and the travel of the magnetic tape (3) is driven by the respective reel disks a and a. It is also possible to newly record an identification signal on the magnetic tape (3) during fast forwarding and rewinding. Next, when trying to remove the cassette α ship, that is, when only the cassette round is loaded, move the movable tape guide (2b).

(2c), (2b'), (2c'),
+71 is in the unloading state shown by the solid line in FIG.

In a device that rewinds and fast-forwards a part of the magnetic tape (3) in a half-loaded state, one fixed head such as the full-width erase head (5) is used to adjust the recording position ra. , a movable tape guide (2b) capable of recording and reproducing identification signals, (
In order to provide the intermediate stop in 2c), it is only necessary to make a simple improvement to the mechanism of the conventional tape running device, so that the search based on the identification signal on the magnetic tape can be realized with a simple configuration.

Also, since the magnetic tape (3) only slightly contacts the full-width erasing head (5), the rotating drum (1), and the stationary drum, even if the magnetic tape (3) is running at high speed, the tape b? The risk of scratches and head wear is extremely low.

FIG. 4 is a series diagram showing the tape running path during fast forwarding and rewinding operations in another embodiment of the present invention, in which the recording and reproduction of the recording position identification signal is performed using an audio erasing head (9) or audio signal, control. Go to the signal with 7 dos 1 line, and move the winding side movable tape guide (2b'), (2c'
) is provided with an intermediate stop position, and the movable tape guide (2b'), (2
c') to connect the magnetic tape (3) to the audio erasing head (9) or to the audio signal or control signal.
I and a part of the rotating drum (1) are brought into contact with each other. The operation and effects of this device are exactly the same as those of the embodiment shown in FIG. 3, so a description thereof will be omitted. In addition, the position of the movable tape guide in the state shown in Fig. 4 (1.i) has changed from the position in the state shown in Fig. 3 in accordance with the change in the position of the recording position identification signal head. This position is called the second position, which is the same as the position in the state shown in FIG.

As described above, the feature fTh of this invention is that either the tape guide group on the supply side or the winding side is loaded halfway, and if both are half-loaded, the magnetic tape is wound on the rotating drum. The angle at which it attaches becomes large, which is undesirable.

In the above embodiment, the magnetic tape (3
) is in slight contact with the rotating drum (1), but this is expected to have the secondary effect of making the running of the magnetic tape (3) more stable. It is not a necessary requirement for configuration. In addition, the full-width erasing head (5) and the throat (9) for erasing audio signals were also used as the head for recording and reproducing the recording position identification signal.
It goes without saying that a dedicated head may be provided.

The VH3 system VTR0 loading currently available on the market includes tape guides (2b), (2c) and tape guides (2c).
b') and (2c') are moved in parallel at the same time? )jL Many devices are configured to be in the loading state shown in FIG. 1 or the unloading state shown in FIG.

It is extremely easy to add the mechanism of the present invention as shown in FIG. 3 or 4 to an apparatus having such a configuration, and since the recorded recording position identification signal is recorded on the tape magnetic material, It is possible to search from any of the tapes, and it is also possible to encode recording surface identification and record a plurality of types of recording position identification signals.

Incidentally, although the above description has been made regarding the case of a VH3 system VTR device, it goes without saying that the present invention can be widely used in other magnetic tape devices.

As explained above, according to the present invention, with a simple configuration,
F〃A magnetic tape device that uses a device that does not cause damage to the magnetic tape or wear out the head, and is capable of searching for the recording position by recording a recording position identification signal on the magnetic tape and detecting it. Obtainable.

[Brief explanation of drawings]

FIG. 1 shows a tape running path during recording and playback operations of a conventional VTR device, and at the same time, a system diagram showing the tape running path during recording and playback operations of an embodiment of the present invention shown in FIGS. 3 and 4. , FIG. 2 is a system diagram showing the tape running path during fast forwarding and rewinding operations of the conventional VTR device shown in FIG.
FIG. 3 is a system diagram showing the tape running path during fast forwarding and rewinding operations in one embodiment of the present invention, and FIG. 4 is a system diagram showing the tape running path during fast forwarding and rewinding operations in another embodiment of the present invention. FIG. In the figure, [11 is a rotating drum, (la), (lb)
Hasoka. Video head, (2a), (2b'), respectively.
(61,0υ, as+, a6). The α forces are fixed tape guides, (2b) and (2c), respectively.
). (2c), (2c') + (71 is a movable tape guide, (3) is a magnetic tape, (4) is a guide roller, (5) is a full width erase head, (8) is a tape tension regulator, (9 ) is the audio erasing head, 00)
is the sound (No. 3, the throat to the control signal, the pinch roller on the side, the capstan for α-turbidity, the cassette for ship A, the supply reel for shout, and the take-up reel for Q91, and in each example, f51, iQl, 001 is also used as a recording position identification signal recording/reproducing head. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) It has a rotating drum equipped with a magnetic head for recording and reproducing information on the magnetic tape, and a fixed head for recording and reproducing or erasing information on the magnetic tape, and is suspended between the supply reel and take-up reel of the cassette. In a magnetic tape device in which a magnetic tape is pulled out from a cassette and mounted on the rotating drum and the fixed head, the magnetic tape is mounted so as to be wound around the rotating drum over a predetermined angle during a recording or reproducing operation. and a tape guide mechanism mounted so as to be in contact with the fixed head, and a tape guide mechanism mounted so as to be in contact with the fixed drum without wrapping the magnetic tape around the rotating drum over the predetermined angle during fast forwarding or rewinding operations. 1. A magnetic tape device characterized in that a tape guide mechanism is provided, and the fixed head is also used as a head for recording and reproducing a signal for identifying a recording position on the magnetic tape. (2) The magnetic tape device according to claim 1, wherein the fixed head is a control signal head. (3) The magnetic tape device according to claim 1, wherein the fixed head is a full-width erase head.